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  Subjects -> CHEMISTRY (Total: 831 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (584 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (66 journals)

ANALYTICAL CHEMISTRY (47 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 108)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 20)
American Journal of Analytical Chemistry     Open Access   (Followers: 28)
Analytica Chimica Acta     Hybrid Journal   (Followers: 32)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 29)
Analytical Chemistry     Full-text available via subscription   (Followers: 206)
Analytical Chemistry Insights     Open Access   (Followers: 17)
Analytical Chemistry Research     Open Access  
Analytical Letters     Hybrid Journal   (Followers: 10)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access  
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 24)
Current Analytical Chemistry     Hybrid Journal   (Followers: 6)
Drug Testing and Analysis     Hybrid Journal   (Followers: 5)
Electroanalysis     Hybrid Journal   (Followers: 5)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 5)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 4)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 5)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 5)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 16)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 4)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 4)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 19)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 7)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 20)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 1)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
World Journal of Analytical Chemistry     Open Access  
Journal Cover   Journal of Analytical Chemistry
  [SJR: 0.33]   [H-I: 19]   [16 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2281 journals]
  • A gas chromatograph based on planar systems
    • Abstract: Abstract A chromatographic system consisting of a microinjector with the volume of sampling loop 10 µL, a microchromatographic column with nanodisperse silica particles on a planar aluminum plate, and a catalytic combustion detector adapted for work on planar surface has been presented. A possibility of using the developed microchromatograph for the analysis of a mixture of low-boiling alkanes with preserving performance characteristics of stationary gas chromatographs has been shown. The proposed chromatographic system ensured a substantial decrease in the time of analysis and the significant reduction of the dimensions of the system, energy consumption, and cost of the manufacture and service of the chromatographic equipment.
      PubDate: 2015-09-01
       
  • QuEChERS sample preparation in the simultaneous determination of residual
           amounts of quinolones, sulfanilamides, and amphenicols in food using HPLC
           with a diode-array detector
    • Abstract: Abstract A method is proposed for the simultaneous determination of antibiotics of quinolone series (enoxacin, danofloxacin, lomefloxacin, enrofloxacin, difloxacin, and oxolinic acid), sulfanilamides (sulfanilamide, sulfadiazine, sulfapyridine, sulfamerazine, sulfachloropyridazine, sulfadimethoxine, and sulfaquinoxaline), and amphenicols (chloramphenicol, florfenicol, and thiamphenicol) in foodstuffs by HPLC with diode-array detection at 228 and 280 nm from single weighed portion using a simplified, rapid, and safe QuEChERS sample preparation. The analytical range is 0.01–2 mg/kg for quinolones and 0.002–1 mg/kg for sulfanilamides and amphenicols at a sample weight of 5 g. The relative standard deviation of the results of analysis does not exceed 0.1. The time of analysis is 1–1.5 h.
      PubDate: 2015-09-01
       
  • Modified UFLC-PDA method for determination of nitrosamines
    • Abstract: Abstract Tobacco-specific nitrosamines, viz. N′-nitrosonornicotine (NNN) and 4-methylnitrosamino-13-pyridyl-1-butanone (NNK) were determined by using a modified ultra flow liquid chromatography-photo diode array (UFLC-PDA) technique using C18 100A Phenomenex column (Luna, 5 µm, 4.6 × 150 mm) with 10% acetonitrile (ACN) in 1 mM ammonium acetate buffer pH 8 by ammonium hydroxide; ACN and water with 0.75% glacial acetic acid (pH 2.82) solvent system. It was feasible to compute accurate calibration curve for both compounds using the solvent system by determining the peak area as a function of the concentration. Limits of detection of 0.12 µg/mL for NNN and 0.02 µg/mL for NNK were found. This technique allows a reasonably accurate detection of NNN and NNK with the solvent system developed. The study finds an optimum mobile phase for detecting NNN and NNK with effective resolution.
      PubDate: 2015-09-01
       
  • Development of a cloud-point extraction method for determination of trace
           amounts of copper(II) in water samples
    • Abstract: Abstract A simple and rapid cloud-point extraction method by using a Schiff base extractant, named bis(2hydroxynaphthaldehyde)-1,2-propanediimine, is presented for preconcentration of trace amounts of copper ions in water samples, prior to the determination by flame atomic absorption spectrometry. The process is based upon the complexation of Cu(II) ions by the Schiff base. The formed complexes are soluble in a micellar phase composed by the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114), and then are extracted into the surfactant-rich phase at above its cloud-point temperature. The effect of parameters influencing the extraction efficiency, such as aqueous solution pH, concentration of the Schiff base, amount of the surfactant, equilibration temperature and incubation time were investigated and discussed. Under the optimum experimental conditions, the calibration plot was linear in the range 1–400 µg/L with a limit of detection 0.3 µg/L. A preconcentration factor of 20 was achieved by the presented method. The proposed method was successfully applied for the determination of copper in various water samples.
      PubDate: 2015-09-01
       
  • Normal and second derivative spectrophotometric determination of niobium
           using solid phase extraction technique
    • Abstract: Abstract This paper describes a rapid method for niobium preconcentration, separation and determination by using solid phase extraction (SPE). The activity level of 94Nb is still very low in the environment. However, on account of its long half life, 94Nb would be one of the important isotopes in the near future for the safe management of radioactive waste. SPE method using freshly precipitated microcrystalline naphthalene as an adsorbent has been developed to separate and preconcentrate trace amount of niobium from aqueous samples for the detection by normal and second derivative spectrophotometry. The influence of some analytical parameters on the quantitative recoveries of the Nb(V) was investigated by batch technique. The complex extracted on naphthalene has an absorption maximum at 380 nm. The optimum pH range for the sorption is 7–8. The molar absorptivity is 1.40 × 104 L/(mol cm), the sensitivity being 0.0066 µg/cm2 of niobium. Derivative spectrophotometry in conjunction with extractive pre-concentration of Nb(V) with SPE is used for determining Nb(V) at concentration levels down to 25 ppb in initial sample. The foreign ions interference has been studied and the optimized conditions developed were utilized successfully for the trace determination of niobium in alloy steel, environmental and wastewater samples.
      PubDate: 2015-09-01
       
  • Features and criteria of the overloading of gas chromatographic systems
    • Abstract: Abstract New criteria for evaluating the limits of the mass overloading of chromatographic systems, based on the retention parameters of analytes depending on an amount, peak broadening factors, and the distortion of peak shapes, are compared. The criterion based on the dependence of the retention indices on the masses of analytes in chromatographic zones suggests a qualitative assessment of the effect of the column temperature on the overloading limits. Such an effect observed in gas chromatography has no analogues in the other separation methods. The two other criteria give overloading limits coinciding satisfactorily with each other for both nonpolar and polar analytes. It is confirmed that the anomalies in the temperature dependences of the retention indices of some polar compounds at nonpolar phases (transformation of monotonic functions into dependences with extremes, usually, minima) are not directly connected to the overloading of chromatographic columns, although they are observed in approaching to the overloading limits.
      PubDate: 2015-09-01
       
  • One step controllable electrochemical deposition of silver
           hexacyanoferrate nanoparticles/multi-wall carbon nanotubes/Nafion modified
           electrode for the sensing of phenol
    • Abstract: Abstract A novel silver hexacyanoferrate nanoparticles (AgHCFNPs) were synthesized through one step controllable electrochemical deposition. An AgHCFNPs/multi-wall carbon nanotubes (MWNTs)/Nafion modified glassy carbon electrode (GCE) was fabricated. Scanning electron microscopy (SEM) and electrochemical methods were used to characterize the AgHCFNPs/MWNTs/Nafion/GCE. The SEM images showed that the AgHCFNPs was evenly immobilized on MWNTs. The size of AgHCFNPs was examined around 100 nm. The AgHCFNPs/MWNTs/Nafion/GCE was used for the determination of phenol in 0.1 M KH2PO4—0.1 M K2HPO4 buffer solution (pH 8.0). Under the optimal conditions, the current response of phenol increased linearly with its concentration from 0.6 to 60.0 µM, and the limit of detection was found to be 0.2 µM. The practical application of the present modified electrode was demonstrated by measuring the concentration of phenol in real water samples.
      PubDate: 2015-09-01
       
  • Independent components analysis as an alternative to principal component
           analysis and discriminant analysis algorithms in the processing of
           spectrometric data
    • Abstract: Abstract The possibility of the application of independent component analysis (ICA) to searching patterns in the spectrometric datasets and to discriminating objects is demonstrated. The data of XRF analysis of base enamels, IR spectra of automotive lacquers, and 1H NMR spectra of wines from different regions of Germany are selected for the study. In all three cases, ICA reliably separates groups of objects, increasing the percentage of correct predictions for new samples not included into the model. Moreover, ICA gives results comparable with specialized discriminant analysis methods (linear discriminant analysis, projections to latent structures discriminant analysis, and factorial discriminant analysis) in the classification of the NMR spectra of wines.
      PubDate: 2015-09-01
       
  • Biosensor based on ion selective electrode for detection of L-arginine in
           fruit juices
    • Abstract: Abstract A biosensor has been developed for detection of L-arginine. The biosensor has been constructed using enzyme arginine deiminase as bio-component extracted from Pseudomonas putida MTCC 1313. The immobilization of enzyme was carried out in acrylamide gel, which was fixed onto the ion selective electrode. The optimization and kinetic characterization of free and immobilized enzyme was also studied. The response time of developed biosensor was found <30 s and a good linear range for arginine concentration from 1 to 10-9 M was shown. The developed biosensor was successfully applied for detection of arginine content in fruit juices.
      PubDate: 2015-09-01
       
  • Determination of five phthalate esters in running water and milk by
           micellar electrokinetic capillary chromatography
    • Abstract: Abstract A simple, reproducible and sensitive micellar electrokinetic chromatography method was developed for the separation and determination of dimethyl phthalate (DMP), diethyl phthalate (DEP), dibuthyl phthalate (DBP), dihexyl phthalate (DHP) and bis(2-ethylhexyl) phthalate (DEHP) in running water and milk. Field-enhanced sample injection with reverse migrating micelles was used for on-line preconcentration of the analytes. The buffer contained 50 mM H3PO4–NaOH, 160 mM sodium dodecyl sulfate (SDS), 15% acetonitrile and 20% 2-propanol, at the pH of 2.0. The sample solution was diluted with water containing 5 mM SDS and injected for 5 s with–20 kV after gravity injection of 5 s water plug at 20 cm high. Under the optimum conditions, the analytes were well separated and by optimizing the stacking conditions, about 51, 62, 57, 48 and 43 fold improvement in the detection sensitivities were obtained for DMP, DEP, DBP, DHP and DEHP, respectively. The instrument detection limits (S/N = 3) of DMP, DEP, DBP, DHP and DEHP were 0.1, 0.05, 0.05, 0.02 and 0.05 µg/mL, respectively. The recoveries of DMP, DEP, DBP, DHP and DEHP in water were 86.9–98.7, 88.9–105.2, 91.7–109.4, 93.0–108.2 and 91.0–99.2%, respectively. The phthalates were successfully determined in running water and milk with satisfactory repeatability and recovery. The contents of DEHP and DHP in the running water were 0.45 and 1.23 µg/mL, respectively. The other analytes were not detected in the analyzed running water and milk.
      PubDate: 2015-09-01
       
  • Chromatographic–mass spectrometric determination of free fatty acids
           in blood plasma and urine using extractive alkylation
    • Abstract: Abstract A method is proposed for the extractive alkylation of free fatty acids (FFA) in blood plasma and urine for their subsequent chromatographic–mass spectrometric determination as methyl esters. The list of target compounds includes 19 saturated acids (C6–C24) and 20 unsaturated acids (C16–C24), including ω-3, ω-6, ω-9, and polyunsaturated fatty acids. For the simultaneous extraction of FFA from a matrix and derivatization, extractive alkylation with iodomethane was used. The peculiarity and advantage of the method is integration of the stages of extraction and preparation of volatile derivatives under mild conditions. The recovery and conversion are from 60 to 90%. The analytical range was from 0.02 to 20 µg/mL of a sample. The effect of samples storage conditions on the results of measurements is evaluated. The method was tested in the determination of FFA in blood plasma and urine of volunteers and laboratory animals.
      PubDate: 2015-09-01
       
  • Application of ion chromatography for the determination of biogenic amines
           in food samples
    • Abstract: Abstract Ion chromatography procedure for the simultaneous determination of histamine, tyramine, phenylethylamine, cadaverine and putrescine in different food samples is described. The simple procedure based on isocratic elution, 5 mM HNO3 without organic modifier as mobile phase and conductometric detection without suppression was proposed and discussed in details. The linearity of the tested procedure was between 0.5–5 and 5–100 mg/L, average recoveries for the standard solutions of amines varied between 98–100%, whereas in standard addition method between 96–99%, that indicated acceptable accuracy of the discussed method. The satisfactory reproducibility was proved by values of coefficient of variations (CV) in the range 0.2–5.0% for all tested food samples. The proposed method reveals a number of advantages: fast elution of analytes without mobile phase conductivity suppression, lack of derivatization step, simple sample preparation and environmentally friendly character.
      PubDate: 2015-09-01
       
  • Analytical capabilities of surface-assisted laser desorption/ionization in
           the determination of low-molecular-weight volatile compounds
    • Abstract: Abstract Main approaches to the determination of low-molecular-weight chemical compounds by surfaceassisted laser desorption/ionization (SALDI) are considered. Analytes are adsorbed from a gas phase on the surface of a specially prepared solid-state substrate. Then, the surface is exposed to pulse laser radiation, which leads to ionization and desorption of ions to be detected with a mass analyzer. The factors responsible for the efficiency of ionization are examined, the instrumental versions of SALDI are presented, and the metrological characteristics of this method are given. The high ionization efficiency of basic compounds, which is higher than the efficiency of traditional ionization methods by orders of magnitude, the mild conditions of ionization, the simplicity of performance, and the possibility of combinations with analyte separation systems characterize SALDI as an exceptionally promising method for the determination of low-molecular-weight volatile compounds.
      PubDate: 2015-09-01
       
  • Polynomials and the problem of the quantitative analysis of mixtures
    • Abstract: Abstract The problem of the decomposition of additive spectra of mixtures of the known qualitative composition into components is considered. An algorithm for the determination of component concentrations in such mixtures is proposed based on the representation of spectral curves of different nature by polynomials. The algorithm ensures the search for a solution in the case when the initial information on the spectra of components is presented by fuzzy sets. The workability of the approach is tested in big series of computer experiments using IR spectra of quinary mixtures of organic substances as examples.
      PubDate: 2015-09-01
       
  • Correction for atomic number in X-ray electron probe microanalysis by
           spectra of reflected electrons
    • Abstract: Abstract Spectra of reflected electrons (REs) are studied on specially created equipment with an electron spectrometer. A linear dependence of the intensity of maxima in RE spectra of various elements on their atomic numbers is revealed. A linear equation is derived for calculating losses of electron probe due to REs. The introduction of a Z-correction for atomic number in X-ray electron probe microanalysis is proposed based on the ratio of losses due to RE in the sample and standard. The procedure is verified on a big array of the results of analyses (170 altogether) of different sets of elements with the difference in atomic numbers from 8 to 86. With the introduction the Z-correction, the error of the results of analyses of arbitration samples was characterized by the following parameters: arithmetic mean deviation 0.65%, relative standard deviation RSD = 0.78%. 92% of errors fall within the range ≤2.5%. These performance characteristics are two to three times better than those published previously.
      PubDate: 2015-09-01
       
  • Role of mass spectrometry in the development and medicinal implementation
           of metal-based nanoparticles
    • Abstract: Abstract A new application of mass-spectrometric methods to the identification, characterization, and analysis of nanomaterials developed or used in medicine for diagnostics, treatment, and (or) target-oriented drug delivery is considered. The main advantage of mass spectrometry (MS) in this exponentially developed area is the possibility of obtaining specific elemental and molecular information on the composition, structure, chemical state, and concentration of nanoparticles based on metals and their compounds. In combination with different separation techniques, MS can be used for the monitoring of formation and identification of particle conjugates with both target and transport biomolecules. Attention is focused on inductively coupled plasma MS and its versions suitable for the material analysis of metal particles, including multipurpose (or theranostic1) particles.
      PubDate: 2015-09-01
       
  • Pb 2+ ion induced self assembly of anthracene based chalcone with a
           fluorescence turn on process in aqueous media
    • Abstract: Abstract A simple anthracene based chalcone as a fluorescent chemosensor, capable of detecting Pb2+ in aqueous media, has been synthesized by the reaction between benzaldehyde and 9-acetyl anthracene. The Pb2+ recognition process follows a photo-induced electron transfer mechanism and is scarcely influenced by other coexisting metal ions. Determination of lead in a variety of water samples was performed.
      PubDate: 2015-08-01
       
  • Study of the processes of background formation in the long-wavelength
           region of X-Ray spectrum
    • Abstract: Abstract Using mathematical design of experiments we studied the spectral composition of an X-ray background in the wavelength region 0.3–1.2 nm in the X-ray fluorescence analysis (XRF) of samples with matrices composed of elements with small atomic numbers, viz plant materials. The interpretation of the results allowed us to quantitatively estimate components of X-ray background for spectrometers with wavelength dispersion and to reveal their dependence on the chemical composition of the specimens. Recommendations are formulated for the account of the background in the plant XRF.
      PubDate: 2015-08-01
       
  • A microfluidic chip for the determination of polyphenolic antioxidants
    • Abstract: Abstract A microfluidic system of capillary electrophoresis with electrochemical detection is developed. The process of manufacturing a chip based on polydimethylsiloxane and glass for the determination of electroactive compounds is described. We studied the possibilities of the treatment of the chip channel surface in a gas discharge with sodium dodecyl sulfate, sodium deoxycholate, and an ionic liquid of 1-dodecyl-3-trimethylimidazolium chloride, used as additives to the background electrolyte. It was found that the developed microfluidic system can be used for the determination of polyphenolic antioxidants in green tea and red wine.
      PubDate: 2015-08-01
       
  • Use of composite films based on poly(3,4-ethylenedioxythiophene) with
           inclusions of palladium nanoparticles in voltammetric sensors for hydrogen
           peroxide
    • Abstract: Abstract Possibilities of using new electrode materials PEDOT/Pd and PEDOT:PSS/Pd (where PEDOT is poly(3,4-ethylenedioxythiophene) and PEDOT:PSS is poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate) prepared by the chemical deposition of ultradispersed Pd particles into a polymer matrix as sensor materials for the determination of H2O2 are considered. The structure of films is characterized by electron microscopy and energy dispersive X-ray fluorescence analysis. The voltammetric responses of PEDOT/Pd and PEDOT:PSS/Pd films in solutions containing H2O2 are studied. The conditions of the voltammetric determination of H2O2 on modified metal–polymer electrodes are optimized.
      PubDate: 2015-08-01
       
 
 
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